The distribution of a random variable X and the distribution of the sample average of X are the same.

True

False

1 points

QUESTION 2

Constructing a confidence interval involves computing the

probability of error.

margin of error.

standard deviation for the population.

test statistic.

1 points

QUESTION 3

When the confidence coefficient is .6, alpha is

1 points

QUESTION 4

When the confidence coefficient is .75, alpha is

1 points

QUESTION 5

If the sample size is 76 and the population standard deviation is 16.81 then the standard error is ? (Answer to two decimal places)

2 points

QUESTION 6

For a sample of 54 discount brokers the average price of a $5,000 trade was $33.77. Past surveys of this kind show a standard deviation of $15 so we assume that is the known population standard deviation. Construct a 90% confidence interval and enter the lower bound for the interval. (Answer to one decimal place and do not include a $ sign).

2 points

QUESTION 7

For a sample of 54 discount brokers the average price of a $5,000 trade was $33.77. Past surveys of this kind show a standard deviation of $15 so we assume that is the known population standard deviation. Construct a 90% confidence interval and enter the upper bound for the interval. Hint, your answer should be larger than the one for the previous question since they begin with the same summary data. (Answer to one decimal place and do not include a $ sign).

2 points

QUESTION 8

If there are 38 observations then how many degrees of freedom are there for the t distribution (for a sample mean)?

2 points

QUESTION 9

If there are 49 observations then how many degrees of freedom are there for the t distribution (for a sample mean)?

2 points

QUESTION 10

To construct a confidence interval for the population mean when the standard deviation is known we use a

z value.

t value.

F value.

alpha value.

2 points

QUESTION 11

To construct a confidence interval for the population mean when the population standard deviation is unknown, and therefore must be estimated, we use a

z value.

t value.

F value.

alpha value.

2 points

QUESTION 12

A 2009 sample of New York hotel room prices had an average of $273. Assume this was from a sample of 48 hotels. Assume also that the known standard deviation for the room rates is $72. Construct a 99% confidence interval and report the lower bound for the interval. (Answer to one decimal place and do not include a $ sign).

2 points

QUESTION 13

A 2009 sample of New York hotel room prices had an average of $273. Assume this was from a sample of 48 hotels. Assume that the known standard deviation is $72. Construct a 99% confidence interval and report the upper bound for the interval. Your number should be larger than for the previous problem. (Answer to one decimal place and do not include a $ sign).

2 points

QUESTION 14

If there are 26 df and the confidence coefficient or cc=.8 then the appropriate t value to use when constructing a confidence interval is (answer to three decimal places).

2 points

QUESTION 15

If there are 48 df and the confidence coefficient or cc=.95 then the appropriate t value to use when constructing a confidence interval is (answer to two decimal places).

2 points

QUESTION 16

Alpha is known as the power of a test.

True

False

1 points

QUESTION 17

Given the same data set, a wider confidence interval will have a larger margin of error.

True

False

1 points

QUESTION 18

To construct a confidence interval for the mean you will need

a point estimate.

the expected value from the underlying distribution.

the degrees of freedom.

a p-value.

1 points

QUESTION 19

When constructing a confidence interval for the mean, the choice of whether to use a t value or a z value depends on

the sample size.

whether or not sigma is known.

whether or not you are given the degrees of freedom.

the distribution of the variable for which you are estimating the mean.

2 points

QUESTION 20

If there are 52 observations in a sample, how many degrees of freedom are there? (The context here is for finding a t value when constructing a confidence interval or testing a hypothesis for the population mean).

1 points

QUESTION 21

To find the necessary sample size you need to know the acceptable margin of error.

True

False

Why Work with Us

Top Quality and Well-Researched Papers

We always make sure that writers follow all your instructions precisely. You can choose your academic level: high school, college/university or professional, and we will assign a writer who has a respective degree.

Professional and Experienced Academic Writers

We have a team of professional writers with experience in academic and business writing. Many are native speakers and able to perform any task for which you need help.

Free Unlimited Revisions

If you think we missed something, send your order for a free revision. You have 10 days to submit the order for review after you have received the final document. You can do this yourself after logging into your personal account or by contacting our support.

Prompt Delivery and 100% Money-Back-Guarantee

All papers are always delivered on time. In case we need more time to master your paper, we may contact you regarding the deadline extension. In case you cannot provide us with more time, a 100% refund is guaranteed.

Original & Confidential

We use several writing tools checks to ensure that all documents you receive are free from plagiarism. Our editors carefully review all quotations in the text. We also promise maximum confidentiality in all of our services.

24/7 Customer Support

Our support agents are available 24 hours a day 7 days a week and committed to providing you with the best customer experience. Get in touch whenever you need any assistance.

Try it now!

How it works?

Follow these simple steps to get your paper done

Place your order

Fill in the order form and provide all details of your assignment.

Proceed with the payment

Choose the payment system that suits you most.

Receive the final file

Once your paper is ready, we will email it to you.